I would say don't do it. You haven't asked whether the mounting fluid (presumably used by the scanning guys) will dissolve the ink and make a mess.
I would say, put the 4x5's in a print file sleeve and make all the marks you want on the top... Ask the scanning guys to put the film back int he same place they found it. They should comply....
(as long as they are not retroanticompliant)
Lenny
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